I found that out of the box, all of the motors made clicking noises when rotated in a counter-clockwise direction, but when rotated in a clockwise direction, they were fine. I opened the motors to find there was very little lubricant inside, so I lubricated them. The problem continued.
I changed out the gears in the motors for other torque gears. The problem still continued.
Here’s the interesting part. I changed the gears out for speed gears (1.6:1) and suddenly, the motors were fine. No clicking.
So basically my question is, has anyone else encountered this issue with new 393 motors? If anyone else has, did you find any way to fix it? Considering that 4 of the motors that I have opened have ALL had this problem, I’m a little worried that it is a manufacturing fault, which would be a real pain, as some of these motors need to be used on torque mode.
I think we might have encounter something like this but im not sure if its exactly what your saying… And a question are there new 393 motors, because i think the spec increase since last year. I remember the high speed setting had 8.4 nm torque now it has 9.2? But as far as the issue, i believe the clicking noise could just mean nothing, because sometimes the motors make noises and they are fine, but im not sure.
We have had motors that have come straight from the packet that don’t spin at all, or only spin in one direction, we have also had motors that rattle. But I don’t think we have had clicking motors before.
I don’t think the motors have changed, as far as I can tell, the wiki was updated to reflect the actual measured spec of the motor rather than the original design spec. New motors seem to have the same part numbers on internal components as old motors. I will do more tests when the school year starts and I can get hold of the motors we used last year.
The motors are very highly geared internally and it is a miraclel that you can manually turn them at all. We advise people to never manually turn them. I suspect that there is nothing wrong with your motors.